Orthotrichiales

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Orthotrichiales (subclass Bryidae) An order of medium-sized acrocarpous mosses in which the leaves are ovate to lanceolate, with or without a nerve. The capsules are held erect and are usually ovoid with a double peristome; each capsule may be covered with a bell-shaped, often hairy, calyptra. They are found typically on trees; some species are found on rocks and walls. Genera include Orthotrichum and Ulota.